/Engine/Source/Editor/CurveEditor/Public/CurveEditorSelection.h
Retrieve all selected key handles, organized by curve ID
const [TMap](API\Runtime\Core\Containers\TMap)< [FCurveModelID](API\Editor\CurveEditor\FCurveModelID), [FKeyHandleSet](API\Editor\CurveEditor\FKeyHandleSet) > & GetAll() const